<template>
  <div class="drag" ref="dragDiv" :style="`height: ${h}px;line-height: ${h}px;`">
    <div class="drag_bg"></div>
    <div class="drag_text" :style="`height:${h}px,line-height:${h}px`">{{confirmWords}}</div>
    <div ref="moveDiv" @mousedown="mousedownFn($event)" :class="{'handler_ok_bg':confirmSuccess}" class="handler handler_bg" style="position: absolute;top: 0px;left: 0px;" :style="`height:${h-4}px;margin-top:1px`"></div>
  </div>
</template>

<script>
export default {
  props: {
    h: {
      type: Number,
      required: true
    }
  },
  data() {
    return {
      beginClientX: 0 /* 距离屏幕左端距离 */,
      mouseMoveStata: false /* 触发拖动状态  判断 */,
      maxwidth: '' /* 拖动最大宽度，依据滑块宽度算出来的 */,
      confirmWords: '请按住滑块，拖动到最右' /* 滑块文字 */,
      confirmSuccess: false /* 验证成功判断 */
    }
  },
  methods: {
    mousedownFn: function (e) {
      if (!this.confirmSuccess) {
        e.preventDefault && e.preventDefault() // 阻止文字选中等 浏览器默认事件
        this.mouseMoveStata = true
        this.beginClientX = e.clientX
      }
    }, // mousedoen 事件
    successFunction() {
      this.confirmSuccess = true
      this.confirmWords = '检验成功，通过'
      if (window.addEventListener) {
        document.getElementsByTagName('html')[0].removeEventListener('mousemove', this.mouseMoveFn)
        document.getElementsByTagName('html')[0].removeEventListener('mouseup', this.moseUpFn)
      } else {
        document.getElementsByTagName('html')[0].removeEventListener('mouseup', () => {})
      }
      document.getElementsByClassName('drag_text')[0].style.color = '#fff'
      document.getElementsByClassName('handler')[0].style.left = this.maxwidth + 'px'
      document.getElementsByClassName('drag_bg')[0].style.width = this.maxwidth + 'px'
    }, // 验证成功函数
    mouseMoveFn(e) {
      if (this.mouseMoveStata) {
        let width = e.clientX - this.beginClientX
        if (width > 0 && width <= this.maxwidth) {
          document.getElementsByClassName('handler')[0].style.left = width + 'px'
          document.getElementsByClassName('drag_bg')[0].style.width = width + 'px'
        } else if (width > this.maxwidth) {
          this.successFunction()
        }
      }
    }, // mousemove事件
    moseUpFn(e) {
      this.mouseMoveStata = false
      var width = e.clientX - this.beginClientX
      if (width < this.maxwidth) {
        document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
        document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
      }
    } // mouseup事件
  },
  mounted() {
    this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
    document.getElementsByTagName('html')[0].addEventListener('mousemove', this.mouseMoveFn)
    document.getElementsByTagName('html')[0].addEventListener('mouseup', this.moseUpFn)
  },
  watch: {
    confirmSuccess() {
      this.$emit('getStatus', true)
    }
  }
}
</script>

<style scoped>
.drag {
  position: relative;
  background-color: #e8e8e8;
  width: 100%;
  height: 32px;
  line-height: 32px;
  text-align: center;
}
.handler {
  width: 40px;
  height: 32px;
  border: 1px solid #ccc;
  cursor: move;
}
.handler_bg {
  background: #fff url('../assets/images/slider1.png') no-repeat center;
}
.handler_ok_bg {
  background: #fff url('../assets/images/slider2.png') no-repeat center;
}
.drag_bg {
  background-color: #7ac23c;
  height: 40px;
  width: 0px;
}
.drag_text {
  position: absolute;
  top: 0px;
  width: 100%;
  text-align: center;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
  color: #455873;
  font-size: 14px;
  font-weight: bold;
}
</style>